Yep, collecting opinions.
Mine is an iron head (16), right at 10:1.
In the past I've run 180 for the simple reason that it gives me more head room should something be amiss. ... If the cooling system is working the way it should, the temps should be no higher than 180 ... if it goes higher, you know there is a problem. If I start with 195 and something is amiss .... it might be at 205 before it become very evident. Less time to do what you have to, to get things cooled down.
But ... I imagine the radiator works pretty good at 195, the higher the Delta T between coolant and air temp, the more efficient the heat transfer. My guess is the OEM radiator is designed around an average temp differential that includes 195 degree coolant. But lots of people don't run original radiators now. Coolant formulas have probably changed also.
I think I'll start with a 180 and see how it behaves.
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